Process of preparing carbonic-acid baths.



PAUL G. LEBRAM, OF BERLIN, GERMANY.

PROCESS OF PREPARING CARBONIC-ACID BA'IHS.

Specification of Letters Patent.

Patented Sept. 1, 1908.

Application filed. November 6, 1907. Serial No. 100,975.

To all whom it may concern:

Be it known that I, PAUL G. LEBRAM, merchant, a subject of the King ofPrussia, German Emperor, and a resident of Berlin, Germany,Friedrichstrasse 59/60, have invented certain new and usefulImprovements in Processes of Preparing Carbonic- Acid Baths, of whichthe following is a full, clear, and exact specification.

This invention relates to a process for preparing carbonic acid baths,according to which esters of acids are used for the production of thecarbonic acid (carbon dioxid) instead of the acids which were hitheretoused notwithstanding the disadvantage of being more or less unhandy andoften acting as caustic.

It has already been stated in literature, that the ethyl and methylester of formic acid are decomposed by the action of water. Thisdecomposition is however practically useless for the purposes ofartificial carbonic acid baths because of its slowness, even whenbicarbonates are used. Now I have found, that a suflicient decompositionof bicarbonates may be effected by replacing formic acid esters ofmonovalent alcohols by the corresponding esters of multivalent alcohols.If for instance, the formic acid ester of mannite is added to an aqueoussolution of a bicarbonate, said ester directly decomposes, formingformic acid and mannite, the former reacting with the bicarbonate andthus producing carbonic acid. The mannite ester of formic acid may beprepared by heat C H (OH) -I'ICOO C H (OH) (COOI-I) 2 we obtain C H(COOH),

I claim:

1. The process of preparing carbonic acid baths, consisting in adding aformic acid ester of multivalent alcohol to an aqueous solution of abicarbonate, substantially as described.

2. The process of preparing carbonic acid baths, consisting in addingthe mannite ester of formic acid to an aqueous solution of a bicarbonate, substantially as described.

PAUL G. LEBRAM. Witnesses:

HENRY I-IAsPEn, WOLDEMAR I-IAUPT.

